MDN 227/2025

SÉCURITÉ

Dredging and drilling works at Nim Wan, Deep Bay (approx. 14 months)

Activeuntil 05 Jan 2027, 00:00 UTC (in 51 days)Received 05 Nov 2025, 00:00 UTC

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MARINE DEPARTMENT NOTICE NO. 227/2025 (Marine Works) Marine Works at Nim Wan, Deep Bay With immediate effect and for a period of approximately 14 months, marine works involving dredging operations and drilling of boreholes will be carried out within the area bounded by straight lines joining the following co- ordinates (WGS 84 Datum) from (A) to (P) and the adjacent shorelines: (A) 22-25.23N 113-54.82E (B) 22-25.30N 113-54.82E (C) 22-25.35N 113-54.77E (D) 22-25.41N 113-55.09E (E) 22-25.48N 113-55.37E (F) 22-25.48N 113-55.57E (G) 22-25.56N 113-55.82E (H) 22-25.55N 113-55.95E (I) 22-25.61N 113-56.11E (J) 22-25.68N 113-56.09E (K) 22-25.71N 113-56.18E (L) 22-25.59N 113-56.22E (M) 22-25.46N 113-55.81E (N) 22-25.47N 113-55.81E (O) 22-25.42N 113-55.59E (P) 22-25.41N 113-55.59E 2. The works will be carried out by two jack-up barges, two dumb lighters and one flat-top barge. Two tugboats, one hopper barge and one work boat will provide assistance. The number of vessels engaged in the works will change from time to time to suit operational requirements. Vessels engaged in the works will display signals as prescribed in international and local regulations. 3. A working area of approximately 30 metres will be established around each barge and lighter. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from each flat-top barge and lighter. Yellow flashing lights will be installed at the four corners of each jack-up barge to indicate its position. 4. Silt curtains, which are large pieces of netting to contain mud and sediments extending from the sea surface to the seabed, will be established within the works area. Yellow flashing lights will be laid to mark the extent of the silt curtains. 5. The hours of work will be from 0700 to 2300 hours daily. Vessels employed for the works will stay in the works area outside the hours of work. 6. Vessels navigating in the vicinity should proceed with caution. 7. A drawing showing the works area is attached to this Notice. This Notice supersedes Marine Department Notice No. 89/2025. This Notice should be read in conjunction with Marine Department Notice No. 137/2024. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 5 November 2025 Action File Ref.: L/M. No.12/25 in MD-PD&PS-F01-075-01A-003-P065

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Analysis

Activeuntil 05 Jan 2027, 00:00 UTC (in 51 days)

Marine works including dredging operations and drilling of boreholes are taking place in an area at Nim Wan, Deep Bay. Work is performed by jack-up barges, dumb lighters, a flat-top barge, tugs and other work vessels; silt curtains and marker buoys with yellow flashing lights will be deployed. A 30 metre working area is established around each barge and lighter; hours of work 0700-2300 daily. This notice supersedes MDN 89/2025.

Type: Dredging / works · severity moderate
Feed: Offshore works, rigs and towingAll warnings of this kind on the map, or as an API feed.
Location: Nim Wan, Deep Bay (area bounded by coordinates A to P and adjacent shorelines)
Validity: From 05 Nov 2025, 00:00 UTC
Until 05 Jan 2027, 00:00 UTCWith immediate effect and for a period of approximately 14 months. Hours of work 0700 to 2300 hours daily (times as stated in notice).
Activity periods: 05 Nov 2025, 00:00 UTC - 05 Jan 2027, 00:00 UTC (Daily 0700-2300 (hours of work stated in notice))
Hazards: dredging operations, drilling of boreholes, moored jack-up barges and lighters, silt curtains, marker buoys with yellow flashing lights, anchor wires and laid anchors
Cancels: MDN 89/2025

Worked out automatically from the warning text on 30 Sept 2026, 11:39 UTC. It can be wrong: the official warning text is the authority.

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This warning's analysis also has:

Action for mariners
Keep-clear distance
Ships named
Lights and buoys affected
Translations
Nearby lights and rescue centres

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Keywordsdredging operations

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